Drilling-machine



(No Model.)

0. A. BENT RUP. DRILLING MACHINE.

7N0. 527,929. Patented Oct. 23,1894.

INVEWZ'OZ? WITNESSES UNITED STATES PATENT OFFICE.

CARL AUGUST BENTRUP, OF CLINTON, IO\VA. I

DRI LLING- MACHINE.

SPECIFICATION forming part of Letters Fatent No. 527,929, dated October23, 1894. Application filed May 9,1894. serial No. 510,597. (No model-iI To all whom it may concern:

Be it known that I, CARL AUGUST BENTRUP, a citizen of Germany, residingat Clinton, in the county of Clinton and State of Iowa, have inventedcertain new and useful Improvements in Drilling-Machines; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention has reference to improve ments in drilling machines and hasfor its object the providing of a vertically oscillating beam, one endof which is pivotally connected with the upper end of the drill ordrillholder.

One of the defects of the present system of drilling by hand is theliability to oscillation at the upper end of the drill, which results indeflecting the lower and operative end of the drill causing the latterto leave a true line and bind in the opening.

My invention has more particular application to drillingin the processof quarrying rock, and is intended to be light, cheap, and portable anda desirable substitute for the hand drill. i

In the process of drilling, greater or less depth ofholes are requisite,depending upon the condition and circumstances of each case. This ofcourse involves the use at certain times of quite a considerable Weightof drill which is very burdensome and laborious to the operators wherethey are compelled to continually lift the same by hand as well as keepthe tool in the true line of the opening; also the deeper the hole, thegreater the amount of friction to be overcome by the operative inraising the drill.

In my invention, the oscillating beam to which the drill is attached asaforesaid, is fulcrumed at or near its longitudinal center and providedat its end opposite to that attachment of the drill with a counterpoiseof any desired weight. A series of openings are formed in the bar oneach side of its pivotal ,the beam D may be adjusted laterally.

support and a weight of any desired amount can be optionally attached tosaid barin any of said openings. By shifting the weight in any of theopenings on the counterpoise side ofthe pivot, the liftinginfluence ofthe counterpoise can be proportionately increased,

and therefore, when a greater amonntofdrill shank is required, the laborof the men in raising the same, can be greatly lessened. On the otherhand, where the rock is unusuallyhard, or for any other reason, thedrill is not deemed heavy enough to enter the rock with asufficientprogress, the force of the successive impacts of the drill may beincreased to any desirable degree by placing said weight in some one ofthe openings in said drill supporting arm, and on the drill side of thepivotal seat of said arm. Of course recesses or deep notches on theupper surface of the said oscillating bar could be used for the samepurpose as the aforesaid I parts in each figure.

A. is the supporting frame which may consist either of a light stepladder having its supporting braces projected above its apex orinatripod similarly provided. On the upper end of the frame A. there areformed upwardly projecting and oppositely seated standards B B. Thetransverse bar 0. is seated in standards B and rigidly held therein. Asuitable portion of the bar 0 between the standards B is rounded toreceive the oscillating beam D. by being projected through a roundopening E. in said beam. The bar 0 is provided with a series of radialopenings F F. and by the insertion of pins G Gthereirlii counterpoiseweight H. is seated on one end of the beam D about the weight of thedrill and its attachments at the other end of said beam, when thesmallest size and length of drill is being used. On the drill end of thebeam D, there are pivotally attached to said beam two vertical links J Jby a cross bolt 1 passing through the upper end of said links andtransversely through the ends of said beam. A head K. is held betweenthe lower ends of the links J by means of a projection K on the uppersurface of head K which projects between links J and is suspended by across pivot bolt 2. In the lower portion of the head K, is pivotallyseated the swivel L. be tween the downwardly projecting limbs 3 3 ofwhich is projected the upper end of the chisel socket M. and which iscarried in swivel L 'by means of transverse bolt 4 passed through thelimbs 3 and the upper end of socket M.

It will be noticed that there is a double flexion between the head K andbeam B afforded by the link connection J J; also that the swivelattachment of swivel L to head K permits free lateral rotation of saidswivel and its appendages, the chisel and chisel socket. The bolt 4furnishes a pivotal movement to the chisel socket M radial to andindependent of its axial rotation with swivel L. The chisel N is seatedin any of the usual modes in socket M and it may be necessary at timesto use a chisel in sections, but the vertical sweep of the end of beam Dwill of itself afford space for the use of chisels of varied lengths.

In the beam D, and at each side of its pivotal bearing and at variantdistances therefrom are formed openings 0 for the optional attachment tosaid beam of th'e weight P as aforesaid. As the latter weight may be ofany desired amount and can be used in any of the openings 0, in beam Don either side of the pivotal support of the latter, it is obvious thatthere is afforded a great range as to the kind and extent of powerexercised by beam D over chisel N.

One of the main advantages of my invention consists in suspending thechisel at the top whereby it naturally hangs in a Vertical position. Theflexible connections shown between the chisel and beam D are necessaryto permit the axial rotation of the chisel and it sometimes requireddeflection in drilling diagonally, but the connection between saidchisel and beam is rigid in a direct line (as distinguished from a chainconnection) so that any movement of either the chisel or beam isimmediately imparted to the other.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, is

In a drilling machine, the combination, with a suitable base, the top ofwhich is provided with a transverse bar provided with radial openings,of two removable pins in said openings, a beam on the bar between saidpins, said beam being provided with a series of openings for adjustingthe same longitudinally on said bar, a weight permanently secured to oneend of the beam, and a chisel flexibly and pivotally supported from theopposite end of the beam, and a weight provided with means forsuspending it from any opening in the beam on either side of the bar,substantially as set forth.

In testimony whereof Iaffix mysignature in presence of two witnesses.

CARL AUGUST BENTRUP.

Witnesses:

JOHN G. MANAHAN, EARNEST HOWELL.

